Glass composition



ill

Patented Dec. 24,, 1940 yer end Herold it. Monitors, filonthbdxe, and Townsend Mb Goon. ltticbero. 1 i; s., iors to cricon Optics! boron-cor, Sonthbridlrc, Moos s voiuntory nssocistlon ct Mossochosette No Brewing. Application lllny i5, 19%, bcrisi No. W360. Renewed Macy lib, Midi) (i Gleims.

This invention relotes to s. new glass composition and to e lens having the properties of seicl composition.

The principal object of this invention is to obtein a. composition oi matter that is substan tielly transparent without absorption in the vieible region of the spectrum but which absorbs strongly in the extras visual region, such as the ultrn-violet end/or lnfrs=red.

Another object of the invention is to provide a lens having the above characteristics.

Another object is to provide it composition or lens heving the properties of desirobly modifying the resulting colors produced by metellic oxides, such as cobalt, vanadium, chromium, nickel, uranium, etc.

Another object is to provide o composition having the additional advantage of being iusible ot a temperature much below that of ordinary glass, thereby reducing the attack on retractories, saving on fuel, and permitting the incorporating of ingredients adversely affected by extremely high temperatures.

Another object is to obtain a glass of these desirable characteristics which will maintain a practical degree oi stability to weathering.

Another object is to provide a. carrier or solvent oi a. relatively colorless brilliant composition having a. low melting point in which ingredients having other desirable characteristics may or may not be incorporated.

Other objects and advantages or the invention will become apparent from the following description and it will be seen that many changes may be made in the arrangement of parts and methods described without departing from the spirit or the invention as expressed in the occomponying claims. We therefore do not wish to be limited to the exact details and methods described as the preferred forms only have been set forth by way of illustration.

In the past there have been other class compositions having similar characteristics as regards the retarding of infra-red and/or ultra.- violet, but such glasses possessed an undesirable color and tended to produce an unpleasant cosmetic effect, and to change the color sensations perceived by the eyes. It is, therefore. one of the primary objects of this invention to overcome the above dimculties in lenses of this nature by pro viding a composition and/or lens having the desired ultra-violet and/or infra-red retarding properties and which will be substantially colorless.

The invention comprises primarily the form- (Ql. tool) log of o. normally colorless vitreous composition having a relatively low melting point, comprism5; phosphoric anhydrlole, oluminum oxide, and barium oxide, up to i595, with or without the addition. of a. smell uantity of potassium nitrate. For example, o composition having desirable characteristics can be formed so iollows:

\ Per cent HPGs n so to ti) Aims-.. 5 to 20 138.603 0 to l5 KNOa o to l The ingredient A1203 of 5 to 20% may be replaced in whole or in part by e. substantiallyeouivalent quantity of a. beryllium pound (Eco).

The foregoing composition is in most instances utilized as a. carrier for ingredients for absorbing infra-red and/or ultra-violet rays, as well as for other ingredients for altering the color oi. the finished composition or lens formed therefrom, but may be utilized without said ingredients in. instances where a colorless, brilliant, and low melting glass composition is desired.

It is to be understood that a. composition or product oi said composition may comprise the loose composition plus any one or more of the infra-red, ultra-violet, or color ingredients. depending upon the nature and characteristics of the lens desired.

To form a lens having infra-red absorptive properties the following composition is preferably utilized:

com-

Per cent HPOs .4. 81 A1 01! 7.5 B-nCOs 4.5 FeaGPOUz-bHaO 1-10 This class has oil or the desirable character istics of the original composition set i'orth above plus the added feature of absorbing infra-red radiations.

To term a. composition or product thereo! having properties for absorbing ultra-violet rays, the base composition plus about /2 to 5 per cent of the weight of the base batch of cerium oxide (C8203) is used depending upon the amount of ultra-violet absorption desired.

To incorporatein the above composition the properties for absorbing infra-red rays as well as ultra-violet rays, a percentage of one to ten of ferrous phosphate (FeflPQr) z-8Hz0) is used. It will be understood that other iron compounds may be used, such as terrous ammonium phosphate, ferrous salts decomposable by heat, or all other known compounds which will produce the desired results.

A composition or product thereof comprising the foregoing properties, that is, infra-red and ultra-violet absorption properties, will be substantially colorless when completed. Therefore, to obtain a lens of the desired color, suitable ingredients such as manganese, nickel, uranium, vanadium, cobalt, etc. may be used, depending upon the color desired.

It is to be understood that the invention is not limited to the specific use oi the color producing ingredients above mentioned, the saidingredlents being set forth only by way or illustration.

It will also be understood that one or more of the above mentioned ingredients may be utilized in the composition and that colors other than blue or green may be formed if desired.

It will also be understood that the percentages set forth in the foregoing formulas are only by way of illustration as to the forming of a usable composition or product of said composition,,and

that the said percentages may be varied within reasonable limits without materially afiecting the composition.

From the foregoing description it will be seen that a novel composition of matter and a novel article possessing infra-red and ultra-violet absorption properties, and being substantially colors less, is formed, and that means is provided by which'the color of said composition may be controlled and varied as desired. Having described our invention, we claim: 1. A.. vitreous composition resulting from the fusing together of Per cent H3903- s1 A1303 7.5 BaCOe--- 4.5 r'eneooaemo 1 tom 2. A vitreous composition resulting from the fusing together of 3. A vitreous composition whose composition will be substantially the same as a composition resulting from the iusing together of:

Per cent m0; 60 to 81 AIZQS, BeO and mixtures of A1203 and BeO l to 20 BaC'Os 1 to 15 FeMPOcisfiE-HO 1 150-10 i. A vitreous composition whose composition will be substantially the same as a composition resulting from the fusing together of:

ii. A vitreous composition whose composition will be substantially the same as a composition resulting from the fusing together oi:

Per cent trees 81 A1203, BeO and mixtures oi A1303 and Eat) 7.5

Boson as segments 1 to 10 6. A vitreous composition whose composition will be substantially the same as a composition resulting from the fusing together of:

} Per cent 81 A1282, BeO and mixtures of A; and

E 50 7.5 F93(PO4)2.8H20 1 to 10 CesOs "weight of the base batch /2 to 5,

EDGAR D. TILLYER.

HAROLD R. MOUL'I'ON. TOWNSEND M. GUNN. 

